golang 模板使用示例

生产环境keepalived.conf 文件使用golang模板渲染示例

//执行渲染代码样例
import "text/template"
type LvsData struct {
 Laddr_v4 []string
 Laddr_v6 []string
 Naddr_v4 string
 Naddr_v6 string
 Static_addr []string
 Channel []common.Lvsmap
 //special_channel []map[string]interface{}
}
type Lvsmap struct {
 Ip_type string `json:"ip_type"`
 Nat_type string `json:"nat_type"`
 Remark string `json:"remark"`
 Proto string `json:"proto"`
 Port string `json:"port"`
 Rport string `json:"rport"`
 Vip []string `json:"vip"`
 Sch_type string `json:"sch_type"`
 Rs []map[string]string `json:"rs"`
 rstag map[string]int
}
func RenderKeepalivedFile(nodeinfo common.NodeInfo) {
 temp := "D:\\GOPATH\\src\\github.com\\tele_test\\template\\keepalived.txt"
 keepfile := "D:\\GOPATH\\src\\github.com\\tele_test\\template\\keepalived.temp"
 responsefile := "D:\\GOPATH\\src\\github.com\\tele_test\\template\\keepalived.conf"
 v := LvsData{}
 v.Channel = nodeinfo.Channel
 v.Laddr_v4 = common.GenAddrInfo().LaddrIpv4 // 获取lvs用于流量转发ipv4的ip
 v.Laddr_v6 = common.GenAddrInfo().LaddrIpv6
 v.Naddr_v4,_ = common.Config.String("Node","NodeIp4")
 v.Naddr_v6,_ = common.Config.String("Node","NodeIp6")
 v.Static_addr = common.GenAddrInfo().StaticIpaddress
 tmpl, err := template.ParseFiles(temp)
 if err != nil {
 panic(err)
 }
 err = tmpl.Execute(os.Stdout, v)
 if err != nil {
 panic(err)
 }
 file, err := os.OpenFile(keepfile, os.O_CREATE|os.O_WRONLY, 0755)
 if err != nil {
 panic(err)
 }
 tmpl.Execute(file, v)
 err = common.DeleteBlankFile(keepfile, responsefile)
 if err != nil {
 panic(err)
 }
}

模板文件编写示例:

{{$proto := "TCP"}} {{$ip_type :="ipv4"}} {{$remark :="backtosource"}} {{$Survi1 := "TCP_CHECK" }} {{$Survi2 := "HTTP_GET" }} {{$Survi3 := "SSL_GET" }}
local_address_group laddr_v4 {
 {{ range .Laddr_v4 }}
 {{ . }}
 {{ end }}
}
local_address_group laddr_v6 {
 {{ range .Laddr_v6 }}
 {{ . }}
 {{ end }}
}
local_address_group naddr_v4 {
 {{.Naddr_v4}}
}
local_address_group naddr_v6 {
 {{.Naddr_v6}}
}
static_ipaddress {
 {{ range .Static_addr }}
 {{ . }}
 {{ end }}
}
{{ range .Channel }}
 {{$port:=.Port}}
 virtual_server_group ipv4_vip_group_{{.Port}}_{{.Rport}} {
 {{ range .Vip }}
 {{.}} {{$port}}
 {{end}}
 }
 virtual_server group ipv4_vip_group_{{ .Port }}_{{.Rport}} {
 delay_loop 5
 lb_algo {{ .Sch_type }}
 lb_kind {{ .Nat_type }}
 protocol TCP
 {{if eq .Proto $proto }}
 syn_proxy
 virtualhost lvscheck.xitong.qihoo.net
 {{ end }}
 {{if eq .Ip_type $ip_type}}
 {{if eq .Remark $remark}}
 laddr_group_name naddr_v4
 {{else}}
 laddr_group_name laddr_v4
 {{end}}
 {{else}}
 {{if eq .Remark $remark}}
 laddr_group_name naddr_v6
 {{else}}
 laddr_group_name laddr_v6
 {{end}}
 {{end}}
 {{ range .Rs }}
 real_server {{ .ip }} {{ .port }} {
 weight {{ .weight }}
 {{ if eq .survi $Survi1}}
 TCP_CHECK {
 connect_port {{ .port }}
 connect_timeout 5
 }
 {{ end }}
 {{ if eq .survi $Survi2}}
 HTTP_GET {
 url {
 path /status.html
 digest {{ .md5 }}
 }
 connect_port {{ .port }}
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 {{ end }}
 {{ if eq .survi $Survi3}}
 SSL_GET {
 url {
 path /status.html
 digest {{ .md5 }}
 }
 connect_port {{ .port }}
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 {{ end }}
 }
 {{ end }}
 }
{{ end }}

本文来自:简书

感谢作者:aside section._1OhGeD

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